2012 ELEKTRO最新文献_第8页

Maximum transmittable data rates for Millimeter-wave fixed wireless links 毫米波固定无线链路的最大可传输数据速率

2012 ELEKTRO Pub Date : 2012-05-21 DOI: 10.1109/ELEKTRO.2012.6225579

T. Schneider, A. Wiatrek, S. Preubler, R. Braun, M. Grigat

引用次数: 3

The anisotropy of transformer oil-based magnetic fluids studied by acoustic spectroscopy 用声谱法研究变压器油基磁流体的各向异性

2012 ELEKTRO Pub Date : 2012-05-21 DOI: 10.1109/ELEKTRO.2012.6225676

J. Kúdelčík, P. Bury, J. Drga, P. Kopčanský, V. Závisová, M. Timko

{"title":"The anisotropy of transformer oil-based magnetic fluids studied by acoustic spectroscopy","authors":"J. Kúdelčík, P. Bury, J. Drga, P. Kopčanský, V. Závisová, M. Timko","doi":"10.1109/ELEKTRO.2012.6225676","DOIUrl":"https://doi.org/10.1109/ELEKTRO.2012.6225676","url":null,"abstract":"The anisotropy in transformer oil-based magnetic fluids upon the effect of an external magnetic field and temperature were studied by acoustic spectroscopy. When a magnetic field is increased, the interaction between the external magnetic field and the magnetic moments of the nanoparticles occurs, leads to the aggregation of magnetic nanoparticles and following clusters formation. However, the temperature of magnetic fluids has also very important influence on the structural changes because of the mechanism of thermal motion that acts against the cluster creation. In present the anisotropy of the transformer oil-based magnetic fluids can be described by two theories. Taketomi theory assumes existence of spherical clusters. These cluster form long chains, aligned in magnetic field direction. Later Shliomis proposed similar theory, in which these chains are formed by nanoparticles. A comparison of the experimental results with the predictions of the Taketomi theory allowed a determination of the cluster radius and the number density of the colloidal particles. These data allowed us to draw conclusions about the changes in the parameters describing the structure of the ferrofluid at different temperatures. On the basis of the measurements performed, it was possible to establish the proportion of the acoustic wave used for excitation of the translational and rotational degrees of freedom.","PeriodicalId":343071,"journal":{"name":"2012 ELEKTRO","volume":"175 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123380152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Analysis of magnetic properties measurement in closed samples 封闭样品的磁性测量分析

2012 ELEKTRO Pub Date : 2012-05-21 DOI: 10.1109/ELEKTRO.2012.6225666

Z. Roubal, P. Marcon, M. Cáp

引用次数: 4

Graph based inversed matrix in electric circuits solutions 电路解中基于图的逆矩阵

2012 ELEKTRO Pub Date : 2012-05-21 DOI: 10.1109/ELEKTRO.2012.6225662

Sona Pavlíková, D. Maga, Boris Simak

{"title":"Graph based inversed matrix in electric circuits solutions","authors":"Sona Pavlíková, D. Maga, Boris Simak","doi":"10.1109/ELEKTRO.2012.6225662","DOIUrl":"https://doi.org/10.1109/ELEKTRO.2012.6225662","url":null,"abstract":"The matrix calculus is very frequently used in electrical engineering to calculate the different parameters of (but not only) electric circuits. One of the most important points of mathematical background of this analysis is the calculation of inverse matrix. This can be realised by numerous well-known algebraic methods (unit/identity matrix, different algebraic supplements, etc.) or numerical techniques. Inverting of matrixes is a well-known method; nevertheless, idea of alternating paths (presented in the paper) is completely new and unpublished. The electric circuit can be represented in the form of a graph and this graph structure rewritten into the form of matrixes. The paper shows the inverse matrix acquisition without using any algebraic technique - directly from graph structure. The presented technology can further be used as an input for any numerical method used for circuit parameters analysis or on- and off-line simulation. Practically, this is based on the following steps: the electric circuit is transformed into the graph structure. A new graph structure is created using the presented algorithm. The matrix system describing this graph structure, obtained without use of any conventional technique, is the inverse matrix of the original graph. The proposed utilization of alternative paths essentially differs from work of other authors.","PeriodicalId":343071,"journal":{"name":"2012 ELEKTRO","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130817527","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Domain-oriented ontology for ITS systems 面向领域的ITS系统本体

2012 ELEKTRO Pub Date : 2012-05-21 DOI: 10.1109/ELEKTRO.2012.6225683

P. Pribyl, V. Fábera, V. Paltus, L. Lyfa

引用次数: 3

Sophisticated Denial of Service attacks aimed at application layer 针对应用层的复杂拒绝服务攻击

2012 ELEKTRO Pub Date : 2012-05-21 DOI: 10.1109/ELEKTRO.2012.6225571

Veronika Durcekova, Ladislav Schwartz, N. Shahmehri

{"title":"Sophisticated Denial of Service attacks aimed at application layer","authors":"Veronika Durcekova, Ladislav Schwartz, N. Shahmehri","doi":"10.1109/ELEKTRO.2012.6225571","DOIUrl":"https://doi.org/10.1109/ELEKTRO.2012.6225571","url":null,"abstract":"Popularity of application services offered by Internet has grown a lot in recent years. Basically, Internet was built with the focus on its functionality and not with the focus on the security tasks. This has led to discovering embedded weaknesses in Internet architecture, which can be misused by attackers with malicious purposes. This paper focuses on application layer Denial of Service (DoS) and Distributed Denial of Service (DDoS) attacks detection, because these attacks present a continuous critical threat to the Internet services. DDoS attacks are typically carried out at the network layer. However, there is evidence to suggest that application layer DDoS attacks can be more effective than the traditional ones. Over some period of time, researchers proposed many solutions to prevent the DoS/DDoS attacks from different OSI layers, but there has been done only a very small research on application layer. In this paper, we consider sophisticated attacks that utilize legitimate application layer requests from legitimately connected network machines to overwhelm Web server. Since the attack signature of each application layer DDoS is represented in abnormal user behavior, we propose several mechanisms, which can be used for application DoS/DDoS attack detection.","PeriodicalId":343071,"journal":{"name":"2012 ELEKTRO","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117331001","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 67

Energy Service Companies in Portugal and throughout the world 能源服务公司在葡萄牙和世界各地

2012 ELEKTRO Pub Date : 2012-05-21 DOI: 10.1109/ELEKTRO.2012.6225648

Isabel Maria Ferro Ferreira Couto Soares, F. M. Barbosa

引用次数: 1

The concept of application for intelligent building management on a "SaaS" platform 智能楼宇管理的概念应用于“SaaS”平台

2012 ELEKTRO Pub Date : 2012-05-21 DOI: 10.1109/ELEKTRO.2012.6225682

P. Petvaldsky, P. Bilik

引用次数: 0

Communication systems in transport — Hybrid ITS interface 运输中的通信系统。混合ITS接口

2012 ELEKTRO Pub Date : 2012-05-21 DOI: 10.1109/ELEKTRO.2012.6225607

P. Holecko, E. Bubeníková, R. Pirník